### What problem does this PR solve?
Fix: Optimized variable node display and Agent template multi-language
support #3221
- Modified the VariableNode component to add parent label and icon
properties
- Updated the VariablePickerMenuPlugin to support displaying parent
labels and icons
- Adjusted useBuildNodeOutputOptions and useBuildBeginVariableOptions to
pass new properties
- Optimized the Agent TemplateCard component to switch the title and
description based on the language
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
f89e55ec42